Have you successfully installed Revit 2023? If you continue to face serial number errors, contact Autodesk Support directly via their live chat—they are remarkably helpful for genuine license holders.
While standalone serial numbers are obsolete, some enterprise organizations still utilize legacy network licenses (Multi-User subscriptions) via the Network License Manager (NLM). If your company uses a network license for Revit 2023: revit 2023 serial number and product key
If your specific organizational infrastructure, network license file, or legacy student environment requires a serial number, you can locate it using these steps: Have you successfully installed Revit 2023